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Lots of great information in this thread but with all the different combinations of parts it's difficult to find the answer to these questions...

I have:
MY04 WRX with stock hood scoop
MY05 STI TMIC
Already nicely fitted to the car and I want to keep the stock WRX scoop.

Questions:
Will a USDM 06/07 STI splitter fit under the stock MY04 WRX hood scoop?
Any fitment issues between bellows and TMIC?

I ran a v7 splitter under the 04/05 (WRX) scoop- it's pretty close- the v7 is a scouch low- I modified mine slightly to make a tighter fit (top portion against the scoop)- a little extra foam as well

be curious how the 06/07 one works, but for sure the v7 one can be made to work

remember the seal (rubber) portion plays a role as well- the v7 seal comes straight down- perfect if you shortened your brackets for the install, the v8 (04/05) the seal angles rearward-perfect if you left the brackets alone and instead used lengthened hoses